Sir Iain Duncan Smith is one of the longest-serving MPs currently in parliament, having been first elected in April 1992 and ranking fifth among all 650 MPs for length of service, and third among his 116 Conservative colleagues. He participated in 50.65% of voting divisions, casting 233 votes and ranking 333rd overall, while contributing 359 times to debates across 145 debates and ranking 161st overall, with particular focus on foreign affairs, defence, international development, and justice matters. His debate contributions are notably more prominent than his voting participation. As a backbench MP with no current government post, he remains one of the most active debaters among those elected in 1992, ranking first in debate contributions among that cohort of six members.

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